I am currently playing Crobat as my main deck and have had a surprisingly good run with it.
Pokemon:
3 Zubat (With free flight... Duh!)
3 Crobat
1 Roselia
1 Roserade
2 Trubbish (any will do)
2 Garbodor (with garbotoxin)
2 Mewtwo EX
When I first started playing this deck, I was very much aware that the biggest hurdle to the poison stratergy is currently the amount of free retreat or retreat like effects (thinking Rush In here). To mitigate that, Garbodor was an obvious inclusion. This meant that I had to make my deck as immune to Garbotoxin as possible.
I did originally have a couple of Venipede and Whirlipede in the deck, but I took them out. They were far to expensive in terms of the resources spent to get them attacking or retreating them if they got pulled out into the Active position.
Roserade is amazing. When played right, this card has just straight up won me the game.
The 2 Mewtwo are here for pretty obvious reasons. I needed something that could be a power hitter and Mewtwo fills that role. It's kind of like the backup plan incase Crobat isn't cutting it.
Supporters:
(Note that I am still tinkering with the Supporters in my deck, so by no means take this as a definative list)
3 Colress
3 Juniper
3 Skyla
2 N
I prefer Colress to Bianca and to N. Bianca makes me feel like I have to play out my hand to rapidly, I prefer a much more controlled playstyle. N gives my opponent a new hand... I wanted a happy median and I feel that Colress fills this role. Sure enough, early game his value is pretty dicey, but I think the rate at which his use increases through the game make it an acceptable trade off.
Juniper is still great. I shouldn't really have to say more.
Skyla is a cruical part of this deck, but in testing, I have found 3 to be a fine number. adding a 4th isn't a terrible idea, I just find room to be very tight in this deck.
N. Still a good card. I just prefer Colress. I always hate playing N when I know my opponent's hand is bad and I hate giving people outs.
Items/Stadiums:
(Again just like the Supporters, this changes about every time I play the deck... Also, I am not sure if the numbers on a couple of items is wrong...)
4 Catcher
4 Hypnotoxic Laser
3 Rare Candy
2 Level Ball
2 Virbank City Gym
3 Switch
2 Rescue Scarf
2 Giant Cape
Not a whole lot to really add here. I am assuming that you can see why my choices are the way they are.
Virbank is only a 2 of, because of the amount of play it is seeing in other decks. If it doesn't see a whole lot of play in your local meta, try 3.
Switch is a must if playing with Garbodor. I don't tend to attach energies to it, so I basically never will be able to pay the obscene retreat cost in any sort of timely fashion. Best to be able to ignore it.
Rescue Scarf is great on Garbodor. Or Crobat.
Giant Cape is the Crobat aid of choice for me. It makes Crobat that little harder to KO (Keldio needs 2 more energy, Darkrai now needs a plus power etc etc etc).
I'd add an Energy count, but I only currently run 12, 4 of which are DCE, so I will let you figure out the others
In a funny sort of way, this deck only really struggles with the mirror match, it basically comes down to who has the best draw. Garbodor helps you keep Darkrai and Keldeo in check and the Steel decks aren't really an issue as you generally aren't attacking with an EX.
I have found that Crobat can be a viable tournment deck, I myself went 3-1 at a tournament on Sunday (I missed top cut by only 2 points of resistance...
). You just need to have a fair idea of the expected metagame and test against it. Knowing the right line of plays against the big decks can make or break your day.
Hope my ramblings have helped,
Pope.
